IBM Support

IJ49044: GPFS CLUSTER EXPERIENCE SLOWNESS AFTER UPGRADING TO 5.1.7

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APAR status

  • Closed as program error.

Error description

  • Problem: The performance degraded after upgraded to
v5.1.7.0

GPFS Cluster experience slowness after upgrading from
"5.0.5.0 " to the "5.1.7.0 GPFS Version . Batch jobs
usually take 30 mnts to complete but afte the GPFS
upgrade they are taking 6-8 hours to complete.

OS: Linux Kernel 3.10.0-1160.99.1.el7.x86_64
Reported in GPFS version: V5.1.7.0

Local fix

  • It's a defect and the detail is in the above RTC issue.

Problem summary

  • When the file is opened with O_APPEND flag, sequential small
read performance is poor.

Problem conclusion

  • Fix the incorrect logic when file is opened with O_APPEND flag.

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IJ49044
    • 

  • Reported component name
    SPEC SCALE STD
    • 

  • Reported component ID
    5737F33AP
    • 

  • Reported release
    517
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2023-10-27
    • 

  • Closed date
    2024-01-11
    • 

  • Last modified date
    2024-01-11
    • 





    

  • APAR is sysrouted FROM one or more of the following:
    

    • 

  • APAR is sysrouted TO one or more of the following:
    

    • 



Fix information


    

  • Fixed component name
    SPEC SCALE STD
    • 

  • Fixed component ID
    5737F33AP
    • 



Applicable component levels


    








      
              
                            

              

              [{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"STXKQY"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"517","Line of Business":{"code":"LOB26","label":"Storage"}}]
              

                                                                    

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            11 January 2024
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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